Antifreezing fire-extinguishing compound.



UNITE gTATEfi PATEXT @FFTQ.

MAX BRESLAUER, OF CHARLOTTEXBL'RG, GERMANY, ASSIGXOR TO THE FIRM OF \Y. GRAAl-l 8: COMPAGXIE GES. MIT BESCHR. HAFTL'NG, OF BERLlX, GERUAXY.

Specification of Letters Patent.

Patented July as, 1908.

Application filed November 9, 1906. Serial No. 342,664.

To all whom it may concern:

.Be it known that I, Max BRESLALER, achemist and a doctor of philosophy, a subject of the German Emperor, and aresi dent of 29 Kleiststrasse, in the city of Charlottenburg, near 'Berlin, Kingdom of Prussia, and German Empire, have invented a certain new and useful Antifreezing Fire- Extinguishing Compound, of which the folloning is a specification.

This invention has reference to a frost proof fire extinguishing agent, which is composed as essential constituent ofsulfo-cyanic compounds. Solutions of certain sulfocyanic compounds possess to a very high degree of fire extinguishing properties and they will not freeze at a temperature as low as 45 degrees to about 50 degrees C. below zero. Of the sulfo-cya'nic compounds, the salts composed of the alkalies and of the alkaline earths and the sulfo-cyanic acid are-chiefly to be considered in this connection. As examples reference may be made to sulfosolution of these substances is projected upon the fire, sulfureted hydro-carbon compounds are formed as a result of the decomposition of the salts and of their reaction upon each other, these compounds constituting the only reliable extinguishing agent in the case of fires .in smoke chimneys.- Moreover, the sulfocyanid compounds, and among these particularly the sulfo-cyanid compounds of thealkalies and of the alkaline earths, possess the property of adapting themselves to the conditions prevailing in the case of chemical fire extinguishers.

Chemical fire extinguishers present the inconvenience of freezing at low temperatures, so as to become unfit for use in case of need. Other substances which would normally prevent the freezing of liquids cannot be used with success in this connection, as they either form precipitates, which would make the ap paratus inoperative by clogging the openings,.or they are inflammable themselves and produce undesirable results, when thrown kind described, in view of the fact that car-- bonate of lime would be preci itated upon the addition of calcium chlori 'to'the soda solution, the said precipitate clogging up the discharge opening of the fire extinguishing apparatus. Calcium chlorid would also "be unfit for use on account of its strongly hygroscopic properties, for when projected upon burning timber ointly with the ordinary fire extinguishing liquid, it would be a cause of dry-rot'in the buildings. The-sulfo-cyanid compounds and in particular the alkali salts of the sulfo-cyanic acid on the other hand can be used Without difiiculty in combination with the soda solution, without attacking the metal parts of the apparatus. They render the soda solution absolutely proof against freezing and they do not form precipitates, which would be Liable to clog the apparatus.

Adecrease of temperature down to about 45 degrees or 50 degrees C. below zero is not sufiicient to solidify the soda solution and does not deprive it of its property of generating carbonic acid gas by the action of muriatic acid. Besides, the fire extinguishing property of the fire extinguishing liquid is greatly increased by the addition of sulfocyanid compounds.

Both to the pure solution of sulfo-cyanid compounds as well as to their solution containmg in addition other chemical substances for special purposes, an addition of glycerin may be made. The latter addition may be used in'those cases in particular, when the fire extinguishing liquid need not be frost proof down to 45 to 50 degrees C., and when the fire extinguishing properties o th liquid should rather be largely increasd oy the addition of comparatively small amounts of sulfo-cyanid compounds.

In charging an ordinary fire extinguishing apparatus I use on 3 liters of water .5 kilos of sulfo-cvanid of potassium and 330 gra ns of In witness whereof I have hereunto signed bioarbonate of soda. I mywname this 25th day of October 1906, in 10 Having thus described Iny'invention what the presence of two subscribing witnesses. I claim is: '5 Anti-freezing fire extinguishing compound MAX BREbLAUER" which consists of a Watery solution of sulfo- Witnesses: cyanids and alkalinecarbonates, SllbStfiIl- HENRY HASPER,

tial lyas described. WQLDEMAR HAUPT 

